Self-seeded operation of the LCLS hard X-ray FEL in the long-bunch mode

Details Self-seeded operation of the LCLS hard X-ray FEL in the long-bunch mode Self-seeded operation of the LCLS hard X-ray FEL in the long-bunch mode

2010-12-16

arxiv.org/abs/1012.3617v1

Physics

Accelerator Physics

Scientific paper

Self-seeding options for the LCLS baseline were recently investigated using a scheme which relies on a single-crystal monochromator in Bragg-transmission geometry. The LCLS low-charge (0.02 nC) mode of operation was considered in order to demonstrate the feasibility of the proposed scheme. The wakefield effects from the linac and from the undulator vacuum chamber are much reduced at such low charge, and can be ignored. In this paper we extend our previous investigations to the case of the LCLS mode of operation with nominal charge. Based on the LCLS start-to-end simulation for an electron beam charge of 0.25 nC, and accounting for the wakefields from the undulator vacuum chamber we demonstrate that the same simplest self-seeding system (two undulators with a single-crystal monochromator in between) is appropriate not only for short (few femtosecond) bunches, but for longer bunches too.

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